“pre-image”的概念、定义、翻译、参考文献-科学参考

单词	pre-image
释义	pre-image Mathematics Given a function $f : X \to Y$ and $A\subseteq Y$ , the pre-image $f^{- 1} (A)$ of A is $f^{- 1} (A) = {x \in X \| f (x) \in A} \subseteq X .$ This notation does not imply that f is invertible (see invertible function). Note $f (f^{- 1} (A)) \subseteq A$ , but equality does not generally hold.
随便看	General Strike((UK)) general theory of relativity general topology general will generating curve generating function generating polynomial generation generations generation time generative grammar generative nucleus generator generator cell generator(group theory) generator matrix generator potential generic generic compaction ring main ring modulator Ring Nebula ring network Ring of Fire ring of Gyges

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